Right now they are both set to 8. I assume once eyes make either way, then it counts 8 pulses and stops. I was just wanting to get it a little closer to the rear, but wanted to see what others have it set on. I have a Suburban, and it seems the rear glass just does not get a clean as I would like. It seems boom is a little too far away. So this is why I was checking before I make any changes. I will just move it one number at a time and see how it does. It is an adjustable setting.